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Nebula
A nebula is a giant cloud of gas (mostly hydrogen and helium) and cosmic dust situated between stars in the interstellar medium. Nebulae serve as sites of stellar birth and death—including emission nebulae that glow from ionized gas, reflection nebulae that scatter starlight, and dark nebulae that obscure background stars.
Source: science.nasa.gov
APODs including "Nebula"
Veil Nebula: Wisps of an Exploded Star
19/09/2017
NGC 6334: The Cat's Paw Nebula
13/09/2017
The Heart Nebula in Hydrogen, Oxygen, and Sulfur
27/08/2017
The Eagle and The Swan
24/08/2017
Milky Way over Chilean Volcanoes
21/08/2017
NGC 2442: Galaxy in Volans
17/08/2017
Stars, Gas, and Dust Battle in the Carina Nebula
15/08/2017
Pelican Nebula Close-up
03/08/2017
The Dust Monster in IC 1396
02/08/2017
A Sagittarius Triplet
27/07/2017
IC 1396: Emission Nebula in Cepheus
20/07/2017
Celestial Fireworks: Into Star Cluster Westerlund 2
Video
04/07/2017
Mountains of Dust in the Carina Nebula
02/07/2017
Composite Messier 20 and 21
28/06/2017
The M81 Galaxy Group through the Integrated Flux Nebula
27/06/2017
The N44 Superbubble
25/06/2017
Markarian's Chain to Messier 64
24/06/2017
The Great Nebula in Carina
13/06/2017
IC 418: The Spirograph Nebula
11/06/2017
Saturn in the Milky Way
10/06/2017
M27: Not a Comet
09/06/2017
Orion: Belt, Flame, and Horsehead
04/06/2017
Approaching the Bubble Nebula
Video
31/05/2017
A Zodiacal Sky over Horseshoe Bend
22/05/2017
In the Center of the Lagoon Nebula
21/05/2017
A View Toward M101
20/05/2017
Simeis 147: Supernova Remnant
18/05/2017
The Multiwavelength Crab
11/05/2017
Star Formation in the Tadpole Nebula
07/05/2017
The Red Spider Planetary Nebula
19/04/2017